Orientation-controlled crystallization of γ-glycine films with enhanced piezoelectricity
Orientation-controlled crystallization of γ-glycine films with enhanced piezoelectricity
复制标题
具有增强压电性的γ-甘氨酸薄膜的取向控制结晶
DOI：
10.1039/d2tb00997h
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发表时间：
2022
影响因子：
7
通讯作者：
Wang, Xudong
中科院分区：
文献类型：
--
作者：
Sui, Jiajie;Li, Jun;Gu, Long;Schmidt, Connor A.;Zhang, Ziyi;Shao, Yan;Gazit, Ehud;Gilbert, Pupa U.;Wang, Xudong
甘氨酸是最简单的氨基酸，由于其优异的生物相容性和强的面外压电性，被认为是一种有前途的功能生物材料。实际应用要求甘氨酸薄膜的强压电极性<001>方向与薄膜厚度一致。基于最近开发的聚乙烯醇（PVA）和甘氨酸水溶液的固化方法，在这项工作中，我们证明了合成薄膜的晶体取向是由甘氨酸晶核的取向决定的。通过表面曲率调节来控制局部成核动力学，我们将成核位点从液膜的边缘转移到中间，从而垂直对齐<001>方向。结果，PVA-甘氨酸-PVA 夹层薄膜表现出最高的平均压电系数 d33，为 6.13 ± 1.13 pC N−1。这项工作展示了一种有前途的动力学方法，可以在可扩展的生物晶体制造过程中实现结晶和性能控制。
Glycine, the simplest amino acid, is considered a promising functional biomaterial owing to its excellent biocompatibility and strong out-of-plane piezoelectricity. Practical applications require glycine films to be manufactured with their strong piezoelectric polar <001> direction aligned with the film thickness. Based on the recently-developed solidification approach of a polyvinyl alcohol (PVA) and glycine aqueous solution, in this work, we demonstrate that the crystal orientation of the as-synthesized film is determined by the orientation of glycine crystal nuclei. By controlling the local nucleation kinetics via surface curvature tuning, we shifted the nucleation site from the edge to the middle of the liquid film, and thereby aligned the <001> direction vertically. As a result, the PVA–glycine–PVA sandwich film exhibits the highest aver-age piezoelectric coefficient d33 of 6.13 ± 1.13 pC N−1. This work demonstrates a promising kinetic approach to achieve crystallization and property control in a scalable biocrystal manufacturing process.